期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 15, 页码 12684-12691出版社
AMER CHEMICAL SOC
DOI: 10.1021/am502675c
关键词
oxygen reduction reaction; oxygen evolution reaction; transition-metal oxide; spinel; nanocarbon; covalent coupling; metal-air battery
资金
- Advanced Energy Storage Research Programme [IMRE/12-2P0503, IMRE/12-2P0504]
- Institute of Materials Research and Engineering (IMRE) of the Agency for Science, Technology and Research (A*STAR), Singapore
- Industrial Orientation Programme of Nanyang Technological University, Singapore
Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential reactions for energy-storage and conversion devices relying on oxygen electrochemistry. High-performance, nonprecious metal-based hybrid catalysts are developed from postsynthesis integration of dual-phase spinel MnCo2O4 (dp-MnCo2O4) nanocrystals with nanocarbon materials, e.g., carbon nanotube (CNT) and nitrogen-doped reduced graphene oxide (N-rGO). The synergic covalent coupling between dp-MnCo2O4 and nanocarbons effectively enhances both the bifunctional ORR and OER activities of the spinel/nanocarbon hybrid catalysts. The dp-MnCo2O4/N-rGO hybrid catalysts exhibited comparable ORR activity and superior OER activity compared to commercial 30 wt % platinum supported on carbon black (Pt/C). An electrically rechargeable zinc-air battery using dp-MnCo2O4/CNT hybrid catalysts on the cathode was successfully operated for 64 discharge-charge cycles (or 768 h equivalent), significantly outperforming the Pt/C counterpart, which could only survive up to 108 h under similar conditions.
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